Molding machine



April 3, 1928. 1,664,559

- E. C. HOLMES MOLDING MACHINE Filed May 9, 1925 w IN VEN TOR W WW Afro/WE Y5 Patented Apr. 3, 1928.

UNITED STATES PATENT OFFICE.

EDWARD C. IIQLMES, OF CINCINNATI, OHIO.

MOLDING MACHINE.

Application filed May 9, 1925. Serial No. 29,211.

chine enabling .a plurality of spirally fluted patterns to be insertable within a .moldwith the necessary twisting motion which will combine the correct longitudinal and rotative motion so that the patterns formed in the molding sand within the flasks of the machine will correspond withjthe spirally fluted pattern-s which are inserted, so that screw threaded spikes can be made very economically in quantity production. Further it is my object to withdraw the patterns with the necessary receding motion which will not spoil the pitch of the spirally fluted impressions in the molding sand. It is further my object to provide a means for molding a plurality of spirally fluted spikes by a simple device which may be inserted'on any standard molding machine.

Referring to the drawings:

Figure 1 is a side elevation, partly diagrammatic showing a standard molding machine withthe position of my structure which enables me to accomplish the above objects indicated in dotted lines.

Figure 2 is a sectional view of the inner construction of the machine as modified in my invention.

Generally indicated at 1 is the support-- ing base of a type of molding machine in combination with which I have illustrated my invention; to which are secured the bosses 2 in which are pivotally mounted the arms 3 which support the head 4. The head slidably retains rods which support the top die 4* which is usually movable with a compressed air cylinder as indicated at 5. In ordinary practice the molding table shown at 6 has a flat table like top 6 on which the flask, indicated at 7 is placed and filled with molding sand. The patterns in ordinary practice are then placed in the molding sand and the top head swung into position and lowered to press the moldingsand securely about the pattern. The head is then released and the flask withdrawn from the pattern-s and taken to the pouring room where the molten metal is poured into the mold to fill up the impressions left by the patterns r I 'He'retofore, it has been almost impossible to securea good mold of a threaded or spirally fluted article it often being neces-,

sary to insert a mold by hand. givingit the necessary twisting motion to make the spiral grooves of the pattern leave the'proper pitch in thejmpressionwithinthe molding sand.

Under thetable I have provided ahous- 111g 8 which carriesa pluralityof patterns 9 which in the illustration shown are for forming impressions of spirally fluted spikes. The lower ends of these patterns are rotatively mounted in a plate 10 which forms a part of the housing. The housing maybe raised and; lowered..by rack bars 11 -which extend through bearings 12 in the frame of the machine. These rack bars mesh with gears 13 which are rotated by a centrally located gear 14 which is mounted on a shaft 15, and a spring handle 16 is secured on this shaft and by lifting up on the han- I dle the gears are turned and the rack bars moved upwardly. The limit of movement of the spring handle is determined by a' slot 17 in an arcuate plate .18 retained in the frame of the machine which the handle bears against when it is moved toward the limit of its upward movement. When the handle is raised to a position opposite the slot it springs into it and thus the upward movement of the housing is determined.

Horizontally disposed and rigidly retained within the frame of the machine is a plate 19 with holes adapted to admit the plurality of patterns in their upward movement, and bearings within the holes slidably retain the patterns. Pins 20 projecting from these bearings extend within the threads of the patterns and as the patterns are moved upwardly withv the raising of the handle, the patterns are turned rotativel-y which result-s in the impressions of the patterns within the molding sand having the same pitch as the patterns.

By regulating the position of the slot 17 which can be done by movement of the plate 18 into a different series of holes 21 in the frame, spikes of desired length can be made. The particular spikes which it is my desire to manufacture have an extended head which I mold by placing the head patterns 22 in the table top 6 through which the threaded patterns pass as they are raised into the molding sand. These headpatterns are hollow to admit the fluted patterns of the shanks of the spikes so that when the impressions in the sand are completed the spikes may be molded, or they may be combined with complementary impressions prepared in another flask in order to produce square headed spikes as required to form spikes in accordance with my Patent #1394268 of February 11, 1919.

Having thus described my invention, what I claim as new and desire to secure by Let ters Patent, is:

1. In combination with a molding machine, a movable top head element and a stationary bottom table elementwith apertures int-he table element and a housing element outside the table element with means for reciprocatingly moving the housing element with relation to the table element, spirally fluted patterns rotatively mounted within the housing element, and. a stationary element with projecting elements adapted to project within the flutes of the patterns, and means for moving the housing element, and the spirally fluted patterns adapted to form female impressions in a mold on the table top.

2. In combination with a molding mathe spirally fluted female impressions in a mold on the table chine, a movable top head eiement and a stationary bottom table element with apertures in the table element and a housing element outside the table element with means for rethe housing element, and a stationary element with projecting elements adapted to project within the flutes ofthe patterns, and

means for movin the housing element, and

patterns adapted to form top, and head patterns adapted'to be'disposed in the apertures to form heads for the spirally fluted impressions. V r

3. In combination with a molding machine, a plurality of patterns comprising tuing disposed on said shafts in similar spiral direction with relation to the axes of said shafts. I r

EDWARD C; HOLMES 

